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Proposed that matter was made up of little particles he called "atomos"
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Identified Oxygen and it's role in combustion
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Determined that elements in a compound will always combined in the same whole number ratios
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In his book " A New System of Chemical Philosophy," he proposed a new comprehensive atomic theory and propose the Law of Multiple Proportions
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Detemined experimentally that equal volumes of gases at the same conditions would contain the same number of particles.
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Worked with the "canal Rays" (later known as the cathode rays) and first proposed the existence of a positively charged particle.
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Discovered that some matter could spontaneously emit high energy that exposed photographic plates.
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Experimentally determined the existence of both electrons and protons using cathode ray tubes.
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Along with her husband, she was the first to isolate a radioactive elemant - radium
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Published his "quantum theory" which explains the behavior of sub-atomic particles in an atom
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Proved that matter and energy are interchangeable; we summarize his paper in the equation E=mc²
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using his famous "oil drop" experiment he confirmed and calculated the charge and mass of an electron
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alaong with Geiger and Marsden, he proved that atoms were mostly empty space with very small positive cores by using the "gold foil" experiment
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proposed the "planetary" model of the atom which replaced the "plum pudding" model
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working with x-ray analysis of atoms, he determined that the number of protons define an atom's idenity and is equal to the elements atomic number number; he also proposed the concepts of isotopes
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indentified a third, a neutral, sub-atomic particle.
